Internal-combustion-engine cylinder and process of making same



Patented Aug. 30, 1927. i

UNITED STATES PATENT OFFICE.

ALFRED L. BOEGEHOLD, OF DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

INTERNAL-GOMBUSTION-ENGINE CYLINDER AND PROCESS OF MAKING SAME: Application filed December 14, 1922. Serial No. 606,797.

The present invention relates to air cooled fin material and the cylinder barrel and cylinders for internal combustion engines, head and between the head materials and 55 and the principal object thereof is to provide between these latter and the barrel. an improved cylinder wherein the joint or In making my improved cylinder, a steel union between the cylinder wall and the tube is setin a suitable mold and an iron usual heat radiating fins thereupon is of plate of suitable thickness cast in one end such a character as to provide for a more thereof in any Wellknown manner so as to 60 effective and efiicient flow of heat from the produce a welded junction between the two cylinder wall to the fins, and to the surmetals. Such a, prepared tube is indicated rounding atmosphere, than has commonly at 10 and 12 in Fig. 2.

heretofore been attained. A suitable mold is then prepared, as in- Further objects and advantages of the dicated in Figs. 2 and 3, having embedded 65 present invention will be apparent from the in its walls a set of cooling fins 14 with their following description, reference being had 'basesvp roject-ing into or forming a wall 15 to the accompanying drawings, wherein a of the mold proper. The mold proper preferred form of embodiment of the pres should b of sufiicient size to allow the tube ent invention is clearly shown. 10 to be positioned therein with a small an- 70 In the drawings: nular space between the tube and the walls Fig. 1 illustrates partly in vertical section of the mold as indicated at in Figs. 2

20 a cylinder made in accordance with my in-. and 4. Th tin plated tube 10 is then propvention. erly positioned in the mold with a space Fig. 2 is a vertical section through a mold 21 beneath it for the molding of the head 75 used in producing my improved cylinder portion 13. and having a cylinder barrel and prepared Around the upper end of the tube there 25 fins set therein. is also formed a second mold for casting Fig. 3 is a horizontal section of Fig. 2, on base 11. 1 line 3-3. There arev provided also a gate and 30 Fig. 4 is an enlargement of a portion of riser 36 for the lower mold and a gate 37 Fig. 3. and riser 38 for the upper mold.

0 The preferred materials used in making When the molds have been thus prepared the present type of cylinder'are those menwith the fins 14 and tube 10in place, a thin tioned in the specific description immedicup of baked core material 40 is placed in- 8 ately following but it should be understood side of tube 10 and after runner boxes have that other materials may be used provided been placed thereon as indicated, the mold 5 they are suitable and have properties adaptis ready for pouring.

ing them for the functions which they will Th pouring operation is conducted as have in the finished cylinder. follows: First molten iron is poured into The cylinder shown in Fig. 1 preferably cup 40 for the purpose of highly heating consists of a steel barrel 10 having a cast on tube 10 and head portion 12. Then after 40 iron base 11. It also shows a bi-metallic an interval of a few seconds, to give the head consisting of a cast in plate of iron tube a chance to get hot, iron for the base 12 and a cast on plate or equalizer 13 of 11 is poured in through gate 37 and, im- 9 copper, these being the preferred metals used mediately thereafter, copper is poured for such parts or portions. through gate 35.

45 Surrounding the upper portion of barrel The tube being thoroughly and highly 10 is a set of cooling fins 14 which will be heated the copper runs in readily and fills more particularly described later. And bespace 21 and rises in annular space 20 weldtween these fins 14 and barrel 10' is a thin ing itself to plate 12, fins 14 and tube 10 layer of copper 15. forming a permanent and effective heat 50 The bonds between the several portions conductive bond. The copper which rises are permanent metallic bonds and are efliin the annular space 20 provides the thin ciently heat conductive, WhlCh property 1s layer of copper 15 of the finished cylinder, highly desirable at the junction between the as will be appreciated.

The cylinder is then removed from the nold cleaned and finished.

While the forms of embodiment of the invention as herein shown and described, constitute preferred forms, it is to be understood that other forms might be adopted, all coming within the scope of. the claims which follow.

What I claim is as follows:

1. An internal combustion engine cylinder comprising a thin steel barrel closed at one end, cooling fins extending longitudinally of the said. barrel and radially therefrom, and a metallic jacket supplied to said cylinder in a molten condition and filling a'space initially present between the exterior pit said barrel and the inner ends of said 2. An internal combustion engine cylinder comprising a thin steel barrel closed at one end by a plate, cooling fins extending longitudinally of said barrel, and radially there from, and a metallic jacket supplied to said cylinder in a molten condition anden closing said plate and filling a space initially present between the exterior of said barrel and th inner ends of said fins.

3. Am internal combustion engine cylinder comprising a thin steel barrel closed at one end by a plate, copper cooling fins extending longitudinally of said barrel and radially therefrom, and a copper jacket the material of which is supplied to said cylinder in a molten condition and which material fills a space initially present between the exterior of said barrel and the inner ends of said fins.

4. An internal combustion engine cylinder comprising a thin steel barrel closed at one end by a; plate, copper cooling fins extending longitudinally of said barrel'and radially therefrom, and a copper jacket the material of which is supplied to said cylinder in a molten condition and which material encloses said plate and fills a space initially present between the exterior of said barrel and the inner ends of said fins.

In testimony whereof I hereunto atfix my signature.

ALFRED L. BOEGEHOLD. 

